Internal-combustion engine



March 19, 1929. SOMMER ET AL INTERNAL COMBUSTION ENGINE Filed Aug. 7, 1926 l wewzz afd He r;

invention has its cylinder or l atented Mar. 19, 1929.

" ,UNITED STATES 1,706,258 PA'YENT QFFICE.

ADOLPI-I soiviivinn, or I-IABERFIELD, risen SYDNEY, AND ALBERT e-Eone-n noon, on p NARRABEEN, NEAR SYDNEY, new scorn wanes, AUSTRALIA, ASSIGNORS or ONE- THIRD TO EDWARD nosnnr srnnmne, on sea-"rims, wAsiin-teron.

INTERNAL-COMBUSTIGN ENGINE.

Application filed August 7, 1926, Serial No.

This invention has been specially devised to provide novel combinations and arrangements of mechanical parts which enable internal. combustion engines of either the two or the four cycle type to be constructed improved double-acting internal combustion engines having comparatively greaterpower than such engines of given. size and weight heretofore produced and wherein is more equal distribution of the load on the working parts of such engines than heretofore.

An improved double-a ting internal coinbustion engine constructed according to this cylinders and valves and kindred parts of ordinary construction but each cylinder is longer and the piston is hollow and of greater lengt-lrthan ordinarily and constitutes a second cylinder which is around a fixed piston or piston headed abutment having a fuel valve therein and supported by hollow walls or stanchions from the engine frame and between which stanchions the piston rod is free to move. From the lower edge of the apron of the piston a piston it will now be described incorporated in a well known make of engines as illustrated in the more or less schematic drawings accompanying and forming part of this complete specification. Figs. 1 and 2 are respectively seetional elevations at right angles to one another of the revelant units of a two-cycle Diesel engine having embodied therein these present improvements while Figs. 3 to (i show details thereof.

The cylinder 7 with usual valvular accessories has a long hollow piston 8 which has two external lugs 9 in or fast to which are pins or gudgeons 1O wherefrom a bifurcated piston rod 11 connects to a cross head 12 having guides and a connecting rod to a crank 127,885, and in Australia August 10, 1525.

(not shown) from a water supply are affixed to the hollow of said piston. The cylinder 7 has a plurality of scavenge ports 17 and 18 and the piston 8 has ports 19 therein which are adapted at arbitrary points of the piston (8) stroke to juxtapose the ports 18 and so open air access to cylinder 18 and permit scavenging thereof. The said piston 8 also uncoversports 17 to permit the scavenging of cylinde 7. i

The cylinder cover 20 may contain the usual el valves and starting valves or said valves it be otherwise housed and they and conuential operating integers may be of any suitable construction and working but as these do not form any part of this present invention no 'i't'urther description is called for.

The second or piston cylinder 13 in present preferred construction has its fuel and startvalves in abutment piston 14 as indicated at 24 but as their valves and the manner in which they are operated is common engineerknowledge and they do not form part of this present invention they are not described or shown herein.

During the normal firing (or outward) stroke of piston 8 in the cylinder 7 air is compressed between the inner face of piston head 8 and the face of abutment piston 14 in the piston cylinder 13 and on completion of such stroke fuel is admitted to said cylinder 18 through the inlet or fuel valve as indicated at 24 and at the commencement of the return stroke ignition takes place assisting the synchronous inward compression stroke of piston 8 in cylinder 7 so giving additional momentum or power to the engine as well as relieving strain on the engine working parts by reason of this being accepted by abutment piston 14 and on completion of the respective strokes the scavenging air is admitted as before explained.

In the present construction the piston 8 is of wrought iron or steel and the inner shell or liner 21 is of cast iron or other metal and the grooves or cavities 22 between the two walls allow the circulation of cooling water.

It is to be clearly understood that the carry iug into effect of this invention is now confined to the precise mechanical constructions described and illustrated so long as the natures and mechanical functions of its main parts are retained for many variations of the construction and arrangement of the parts or=integers Will suggest themselves to thoseskilled in the art to \VhlCh'thlS invention appertains; It will be easily comprehended by the internal combustion engine designer, constructor and/or mechanic that the plied to a four cycle Diesel engine and toignition engines of two-cycle or Otto-cycle and tolike internal combustion'engines.

What We claim as our invention and desire to secure by LettersPatent is;

1. In an internal combustion engine the combination of a fixed cylinder;-a'p1ston reciprocally 'mounted in said 'fiXed cylinder,

comprising ahead and a cylindrical wall extending therefrom; a stat onary piston pos tioned W1thin the cylindrical Wall of said movable piston; a liner located between the i said stationary piston and the inner face of the cylindrical Wall of said movable piston; grooves formed in said inner face of the said cylindrical wall and communicating with a cavity formed in the head of said'movable piston, adapted to receive a cooling medium therefor. V V

2. .ln 'an-internal combustion engine the combination of a fixed cylinder; a piston reciprocally mounted in said fixed cylinder, comprising ahead and a cylindrical Wall extending therefrom; a stationary piston positioned Within the cylindrical' wall of said movable piston; a liner located between the said stationary piston and the inner face of the cylindrical Wall of'said movable piston; grooves formed in said inner face of the said cylindrical Wall and communicating with a cavity formed in the head of said movable piston, adapted to receive a cooling medium therefor; and means forsupplying a cooling medium to said grooves.

In testimony whereof We have signed our 'names tothis specification.

ADOLPH soMMER. ALBERT GEORGE HOOD. 

